1 /* Definitions for Address Resolution Protocol. 2 Copyright (C) 1997,1999,2001,2006,2009 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. 5 6 The GNU C Library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 The GNU C Library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with the GNU C Library; if not, see 18 <http://www.gnu.org/licenses/>. */ 19 20 /* Based on the 4.4BSD and Linux version of this file. */ 21 22 #ifndef _NET_IF_ARP_H 23 24 #define _NET_IF_ARP_H 1 25 #include <sys/cdefs.h> 26 27 #include <sys/types.h> 28 #include <sys/socket.h> 29 30 __BEGIN_DECLS 31 32 /* Some internals from deep down in the kernel. */ 33 #define MAX_ADDR_LEN 7 34 35 36 /* This structure defines an ethernet arp header. */ 37 38 /* ARP protocol opcodes. */ 39 #define ARPOP_REQUEST 1 /* ARP request. */ 40 #define ARPOP_REPLY 2 /* ARP reply. */ 41 #define ARPOP_RREQUEST 3 /* RARP request. */ 42 #define ARPOP_RREPLY 4 /* RARP reply. */ 43 #define ARPOP_InREQUEST 8 /* InARP request. */ 44 #define ARPOP_InREPLY 9 /* InARP reply. */ 45 #define ARPOP_NAK 10 /* (ATM)ARP NAK. */ 46 47 /* See RFC 826 for protocol description. ARP packets are variable 48 in size; the arphdr structure defines the fixed-length portion. 49 Protocol type values are the same as those for 10 Mb/s Ethernet. 50 It is followed by the variable-sized fields ar_sha, arp_spa, 51 arp_tha and arp_tpa in that order, according to the lengths 52 specified. Field names used correspond to RFC 826. */ 53 54 struct arphdr 55 { 56 unsigned short int ar_hrd; /* Format of hardware address. */ 57 unsigned short int ar_pro; /* Format of protocol address. */ 58 unsigned char ar_hln; /* Length of hardware address. */ 59 unsigned char ar_pln; /* Length of protocol address. */ 60 unsigned short int ar_op; /* ARP opcode (command). */ 61 #if 0 62 /* Ethernet looks like this : This bit is variable sized 63 however... */ 64 unsigned char __ar_sha[ETH_ALEN]; /* Sender hardware address. */ 65 unsigned char __ar_sip[4]; /* Sender IP address. */ 66 unsigned char __ar_tha[ETH_ALEN]; /* Target hardware address. */ 67 unsigned char __ar_tip[4]; /* Target IP address. */ 68 #endif 69 }; 70 71 72 /* ARP protocol HARDWARE identifiers. */ 73 #define ARPHRD_NETROM 0 /* From KA9Q: NET/ROM pseudo. */ 74 #define ARPHRD_ETHER 1 /* Ethernet 10/100Mbps. */ 75 #define ARPHRD_EETHER 2 /* Experimental Ethernet. */ 76 #define ARPHRD_AX25 3 /* AX.25 Level 2. */ 77 #define ARPHRD_PRONET 4 /* PROnet token ring. */ 78 #define ARPHRD_CHAOS 5 /* Chaosnet. */ 79 #define ARPHRD_IEEE802 6 /* IEEE 802.2 Ethernet/TR/TB. */ 80 #define ARPHRD_ARCNET 7 /* ARCnet. */ 81 #define ARPHRD_APPLETLK 8 /* APPLEtalk. */ 82 #define ARPHRD_DLCI 15 /* Frame Relay DLCI. */ 83 #define ARPHRD_ATM 19 /* ATM. */ 84 #define ARPHRD_METRICOM 23 /* Metricom STRIP (new IANA id). */ 85 #define ARPHRD_IEEE1394 24 /* IEEE 1394 IPv4 - RFC 2734. */ 86 #define ARPHRD_EUI64 27 /* EUI-64. */ 87 #define ARPHRD_INFINIBAND 32 /* InfiniBand. */ 88 89 /* Dummy types for non ARP hardware */ 90 #define ARPHRD_SLIP 256 91 #define ARPHRD_CSLIP 257 92 #define ARPHRD_SLIP6 258 93 #define ARPHRD_CSLIP6 259 94 #define ARPHRD_RSRVD 260 /* Notional KISS type. */ 95 #define ARPHRD_ADAPT 264 96 #define ARPHRD_ROSE 270 97 #define ARPHRD_X25 271 /* CCITT X.25. */ 98 #define ARPHRD_HWX25 272 /* Boards with X.25 in firmware. */ 99 #define ARPHRD_PPP 512 100 #define ARPHRD_CISCO 513 /* Cisco HDLC. */ 101 #define ARPHRD_HDLC ARPHRD_CISCO 102 #define ARPHRD_LAPB 516 /* LAPB. */ 103 #define ARPHRD_DDCMP 517 /* Digital's DDCMP. */ 104 #define ARPHRD_RAWHDLC 518 /* Raw HDLC. */ 105 106 #define ARPHRD_TUNNEL 768 /* IPIP tunnel. */ 107 #define ARPHRD_TUNNEL6 769 /* IPIP6 tunnel. */ 108 #define ARPHRD_FRAD 770 /* Frame Relay Access Device. */ 109 #define ARPHRD_SKIP 771 /* SKIP vif. */ 110 #define ARPHRD_LOOPBACK 772 /* Loopback device. */ 111 #define ARPHRD_LOCALTLK 773 /* Localtalk device. */ 112 #define ARPHRD_FDDI 774 /* Fiber Distributed Data Interface. */ 113 #define ARPHRD_BIF 775 /* AP1000 BIF. */ 114 #define ARPHRD_SIT 776 /* sit0 device - IPv6-in-IPv4. */ 115 #define ARPHRD_IPDDP 777 /* IP-in-DDP tunnel. */ 116 #define ARPHRD_IPGRE 778 /* GRE over IP. */ 117 #define ARPHRD_PIMREG 779 /* PIMSM register interface. */ 118 #define ARPHRD_HIPPI 780 /* High Performance Parallel I'face. */ 119 #define ARPHRD_ASH 781 /* (Nexus Electronics) Ash. */ 120 #define ARPHRD_ECONET 782 /* Acorn Econet. */ 121 #define ARPHRD_IRDA 783 /* Linux-IrDA. */ 122 #define ARPHRD_FCPP 784 /* Point to point fibrechanel. */ 123 #define ARPHRD_FCAL 785 /* Fibrechanel arbitrated loop. */ 124 #define ARPHRD_FCPL 786 /* Fibrechanel public loop. */ 125 #define ARPHRD_FCFABRIC 787 /* Fibrechanel fabric. */ 126 #define ARPHRD_IEEE802_TR 800 /* Magic type ident for TR. */ 127 #define ARPHRD_IEEE80211 801 /* IEEE 802.11. */ 128 #define ARPHRD_IEEE80211_PRISM 802 /* IEEE 802.11 + Prism2 header. */ 129 #define ARPHRD_IEEE80211_RADIOTAP 803 /* IEEE 802.11 + radiotap header. */ 130 #define ARPHRD_IEEE802154 804 /* IEEE 802.15.4 header. */ 131 #define ARPHRD_IEEE802154_PHY 805 /* IEEE 802.15.4 PHY header. */ 132 133 #define ARPHRD_VOID 0xFFFF /* Void type, nothing is known. */ 134 #define ARPHRD_NONE 0xFFFE /* Zero header length. */ 135 136 137 /* ARP ioctl request. */ 138 struct arpreq 139 { 140 struct sockaddr arp_pa; /* Protocol address. */ 141 struct sockaddr arp_ha; /* Hardware address. */ 142 int arp_flags; /* Flags. */ 143 struct sockaddr arp_netmask; /* Netmask (only for proxy arps). */ 144 char arp_dev[16]; 145 }; 146 147 struct arpreq_old 148 { 149 struct sockaddr arp_pa; /* Protocol address. */ 150 struct sockaddr arp_ha; /* Hardware address. */ 151 int arp_flags; /* Flags. */ 152 struct sockaddr arp_netmask; /* Netmask (only for proxy arps). */ 153 }; 154 155 /* ARP Flag values. */ 156 #define ATF_COM 0x02 /* Completed entry (ha valid). */ 157 #define ATF_PERM 0x04 /* Permanent entry. */ 158 #define ATF_PUBL 0x08 /* Publish entry. */ 159 #define ATF_USETRAILERS 0x10 /* Has requested trailers. */ 160 #define ATF_NETMASK 0x20 /* Want to use a netmask (only 161 for proxy entries). */ 162 #define ATF_DONTPUB 0x40 /* Don't answer this addresses. */ 163 #define ATF_MAGIC 0x80 /* Automatically added entry. */ 164 165 166 /* Support for the user space arp daemon, arpd. */ 167 #define ARPD_UPDATE 0x01 168 #define ARPD_LOOKUP 0x02 169 #define ARPD_FLUSH 0x03 170 171 struct arpd_request 172 { 173 unsigned short int req; /* Request type. */ 174 u_int32_t ip; /* IP address of entry. */ 175 unsigned long int dev; /* Device entry is tied to. */ 176 unsigned long int stamp; 177 unsigned long int updated; 178 unsigned char ha[MAX_ADDR_LEN]; /* Hardware address. */ 179 }; 180 181 __END_DECLS 182 183 #endif /* net/if_arp.h */ 184